<!-- 父级页面:控制除了登录页以外的所有子页面的头部与左侧菜单栏 -->
<template>
  <div style="display: flex;">
    <!-- 左侧菜单栏 -->
    <div :style="{width:(isCollapse?'64px':'208px')}">
      <el-menu
          background-color="#3c82f5"
          style="width:100%;height:100vh;"
          text-color="#fff"
          active-text-color="#ff0"
          unique-opened
          router
          :collapse="isCollapse"
          :collapse-transition="false"
      >
        <el-row style="padding-top: 10px;">
          <el-col :span="2"></el-col>
          <el-col :span="7" style="padding-left: 7px;">
            <el-avatar src="/imgs/admin/logo.png" style="width:35px;height: 35px;"></el-avatar>
          </el-col>
          <el-col :span="isCollapse ? 0 : 13">
            <span style="color:#fff;font-weight:bold;position:relative;top:8px;left:2px;">智慧营销</span>
          </el-col>
        </el-row>
        <el-sub-menu index="1" v-show="menuDisplay1">
          <template #title><el-icon><User/></el-icon><span>商家管理</span></template>
          <el-menu-item index="/user">商家列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="2">
          <template #title><el-icon><Van/></el-icon><span>标签管理</span></template>
          <el-menu-item index="/vehicle">标签列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="3">
          <template #title><el-icon><Location/></el-icon><span>围栏管理</span></template>
          <el-menu-item index="/geofence">电子围栏</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="4">
          <template #title><el-icon><Place/></el-icon><span>调度管理</span></template>
          <el-menu-item index="/application">申请列表</el-menu-item>
          <el-menu-item index="/audit">调度审核</el-menu-item>
          <el-menu-item index="/distribute">车辆分配</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="5">
          <template #title><el-icon><MessageBox/></el-icon><span>字典管理</span></template>
          <el-menu-item index="/dict">数据字典</el-menu-item>
        </el-sub-menu>
      </el-menu>
    </div>
    <div :style="{width:(isCollapse?'calc(100% - 64px)':'calc(100% - 208px)')}">
      <!-- 右侧顶部条 -->
      <el-header style="padding-top: 22px;height:10vh;background-color:#fff;">
        <el-row :gutter="10">
          <el-col :span="18">
            <el-icon style="font-size: 20px;" @click="changeCollapsed"><Expand/></el-icon>
          </el-col>
          <el-col :span="6" style="position: relative;">
            <el-dropdown trigger="click" style="position: absolute;right:20px;">
              <span style="font-size:19px;font-weight: bold;">
                {{user.username}}
                <el-icon><arrow-down/></el-icon>
              </span>
              <template #dropdown>
                <el-dropdown-menu>
                  <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
                </el-dropdown-menu>
              </template>
            </el-dropdown>
          </el-col>
        </el-row>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator="/" style="position: relative;top: 20px;">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in  breadcrumb  ">{{item}}</el-breadcrumb-item>
        </el-breadcrumb>
      </el-header>
      <!-- 右侧主体内容(可变区域) -->
      <el-main style="height:90vh;padding:0;overflow-y: auto;">
        <router-view/>
      </el-main>
    </div>
  </div>
</template>

<script setup>
import {onMounted, ref} from "vue";
import {useRoute, useRouter} from "vue-router";
import { inject } from 'vue';

//定义变量用于控制左侧菜单栏是否折叠
const isCollapse = ref(false);

// const menuDisplay1 = inject('menuDisplay1');
const menuDisplay1 = ref(false);
//定义处理菜单栏折叠的方法
const changeCollapsed = ()=>{
  isCollapse.value = !isCollapse.value;
}

//获取当前登录的用户数据
const user = ref(getUser());

//定义一个退出登录的方法
const logout = ()=>{
  console.log(menuDisplay1.value);
  // if(confirm('您确认要退出登录吗?')){
  //   //退出时要清空用户数据
  //   localStorage.removeItem('user');
  //   //退出后要去到登录页
  //   window.location.href = '/login';
  //   //也需要把已经取出来的user对象清空
  //   user.value = '';
  // }
}

//定义数组用来维护面包屑导航当前展示的值
const breadcrumb = ref([]);
//定义对象用来维护路由path与面包屑数组值的对应关系
let map = {
  '/user':['用户管理','用户列表'],
  '/vehicle':['车辆管理','车辆列表'],
  '/geofence':['电子围栏','围栏管理'],
  '/application':['调度管理','申请列表'],
  '/audit':['调度管理','调度审核'],
  '/distribute':['调度管理','车辆分配'],
  '/dict':['数据字典','字典管理']
};
const route = useRoute();
//定义一个更新面包屑值的方法,只要路由发生变化,立即触发更新面包屑
const updateBreadcrumb = (route)=>{
  //获取当前路由的path值
  const path = route.path;
  //从上面的map对象中获取到指定path对应的面包屑数组值,并赋值给breadcrumb
  breadcrumb.value = map[path];
}
//表示一进到页面立即执行的时机
onMounted(()=>{
  //更新面包屑的值--初始化
  updateBreadcrumb(route);
})
//获取一个路由器对象
const router = useRouter();
//监听路由的变化,如果发生了改变
router.beforeEach((to, from, next)=>{
  //立即更新面包屑的值
  updateBreadcrumb(to);
  //再进行路由跳转
  next();
})
</script>









